Methods and apparatus' of message simultaneity transmitting for mobile phone

A message broadcasting device of an MS(Mobile Station) and a method thereof are provided to write the first message(default) and the second message(hidden), and to distinguish the first message receivers from the second message receiver, so as to send the first message to the second message receiver by adding the second message to the first message. A display(130) displays the first message window and the second message window. An input unit(140) inputs messages on the first and second message windows, and inputs the first message receiver information and the second message receiver information. A modulator/demodulator(170) modulates/demodulates the inputted message information. A transceiver(100) transmits the first message and the second message. A controller(110) controls/monitors so that the messages are inputted and displayed and that the message which includes the first and second messages is transmitted to the second message receiver.